This is a December 64 build San Jose kar and here's a photo of the side showing the stripes. Its too early for a GT so were the stripes just the same on the fender as the door without the mustang letters inside them ?
i have seen a few factory stripe kits on non gt mustangs. yes it would be the same on the fenders without the letters. i have seen various lettering that appeared to be made with some kind of tape. i remember stripes on one car with GT 289 in that area.